randyzwitch/RSiteCatalyst — pull request #123 by randyzwitch (2014-12-19 14:58:51+00:00)
Title: Fix #122

Switched is.na to is.nul, which is the correct treatment for when a field doesn't exist in a list. I also switched the element order, so that short-circuit evaluation will determine whether the element exists first before trying to figure out how many characters it has (first element FALSE = immediately FALSE)